Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 46: Top: Boosted b-tagging, single top
T 46.6: Vortrag
Dienstag, 10. März 2015, 18:00–18:15, L.09.31 (HS 11)
Measurements of differential cross-sections for t-channel single top-quark production in proton-proton collisions at √s = 8 TeV using the ATLAS detector — •Pienpen Seema1, Ian Brock1, Dominic Hirschbühl2, Phillipp Tepel2, and Wolfgang Wagner2 — 1University of Bonn — 2University of Wuppertal
Differential cross sections for single top quarks produced in the t-channel are measured as a function of their transverse momentum and their absolute value of rapidity. The measurements are performed in the lepton+jets final state using 20.3 fb−1 of proton-proton collisions at a center-of-mass energy of √s = 8 TeV with the ATLAS detector. A neural network is used to discriminate between the t-channel signal and its backgrounds. A cut on the neural network discriminator is further applied in order to enhance a purity of t-channel signal sample. The transverse momentum and the absolute value of rapidity of the top quarks and top anti-quarks are unfolded using an iterative Bayesian method, that is used to correct detector effects. Hence, their true distributions are obtained and can be directly compared to theoretical predictions.